Could it be the angle of danglement of the bush on the wishbone playing silly beggars with the adjuster? Reason I ask is the GTS jobs were done 6 or 7 years ago with that bush straight as per the locost, I did the first GTS car(long story) and farted about for hours and couldn't see why folk angled that bush when using sierra uprights as the track rod end is supposed to work at nutty angles. And to me it kinda looked wrong as for working out suspension geometry you use the centres of pivots and ball joints and with the angle bush it looked like it would bend.....Just my views on it by the way and there are lots out there being used and used hard on race tracks with no drama.